回火工艺对含铜塑料模具钢在中性氯化钠溶液中腐蚀行为的影响

doi:10.11896/cldb.21030169

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Abstract The corrosion behavior of Cu-bearing plastic mold steels 4Cr13Cu and 4Cr13 in 3.5wt% NaCl neutral solution was investigated by transmission electron microscope (TEM), scanning electron microscope (SEM) and white-light interferometer. The results indicate that it is capable of 4Cr13Cu tempered at 250 ℃ to acquire a better corrosion resistance. The nano-scale Cu-rich precipitates of 4Cr13Cu tempered at 600 ℃ increase the donor density of the passive film by about 12.4% compared with 4Cr13, and reduce the stability of passive film. In the early stage of corrosion process, the pits of 4Cr13Cu begin to grow both horizontally and vertically, then propagate preferentially towards a vertical direction with a depth range of 560—660 μm. Finally, the pits expand to horizontal direction. Small pitting in close proximity to the surface grows and merges, gradually forming large size pitting pits.

Key words： plastic mold steel 4Cr13 Cu-rich precipitate pitting electrochemical

Published: Online: 2022-10-26

CLC number:	TG142
	TG178

Fund:National Key R&D Program of China (2016YFB0300400, 2016YFB0300404)and the Open Project of State Key Laboratory of Advanced Special Steel (SKLASS 2017-09).

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	XU Zhen
	CHEN Xuan
	WU Xiaochun

Cite this article:

XU Zhen,CHEN Xuan,WU Xiaochun. Effect of Tempering Treatment on Corrosion Behavior of Cu-bearing Plastic Mold Steel in Neutral Sodium Chloride Solution[J]. Materials Reports, 2022, 36(20): 21030169-8.

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http://www.mater-rep.com/EN/10.11896/cldb.21030169 OR http://www.mater-rep.com/EN/Y2022/V36/I20/21030169

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